<div>Dear Lorenzo,</div><div>It is highly recommended to perform hybrid calculations using the ADMM approach (https://manual.cp2k.org/trunk/CP2K_INPUT/FORCE_EVAL/DFT/AUXILIARY_DENSITY_MATRIX_METHOD.html and https://manual.cp2k.org/trunk/methods/dft/hartree-fock/admm.html). You will need to choose suitable fitting basis sets (BASIS AUX_FIT <basis set name>) in the respective kind sections usually from BASIS_ADMM or BASIS_ADMM_UZH. This should accelerate your calculations significantly.</div><div>Regards,</div><div>Frederick</div><br /><div class="gmail_quote"><div dir="auto" class="gmail_attr">Lorenzo Lagasco schrieb am Freitag, 3. April 2026 um 06:19:22 UTC+2:<br/></div><blockquote class="gmail_quote" style="margin: 0 0 0 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"><p>Hello everyone,<br>I'm a new cp2k user and I have a couple of questions, not strictly related to each other:</p>
<ol>
<li>
I have written an input file for a band structure calculation of a system consisting of delafossite CuAlO₂ with an organic dye (coumarin 343) anchored on its surface, using the HSE06 level of theory. However, the calculation appears to be unusually slow (using 4 nodes with 52 processors each, after about 2 hours it has not even completed the first SCF step). I would like to ask whether it would be possible to get feedback on how to optimize the input file, or if there might be some incorrectly set parameters. I have attached both the input file and the xyz file of the system geometry.
</li>
<li>
At the same time, I am working on NVT CP2K dynamics at the PBE+D3 level of theory for aluminosilicate nanosheets in water of different sizes (the simulation box ranges from about 719 to 900 atoms). Currently, the simulations proceed at a speed of about 25 seconds per MD step (using 1 node with 52 processors for each simulation). Since I need a trajectory of 60 ps with a timestep of 0.5 fs, I would like to ask whether it is possible to improve the computational performance. I am also attaching the input file in this case md-GPW.inp<br><br>Thanks for the help!</li></ol></blockquote></div>
<p></p>
-- <br />
You received this message because you are subscribed to the Google Groups "cp2k" group.<br />
To unsubscribe from this group and stop receiving emails from it, send an email to <a href="mailto:cp2k+unsubscribe@googlegroups.com">cp2k+unsubscribe@googlegroups.com</a>.<br />
To view this discussion visit <a href="https://groups.google.com/d/msgid/cp2k/7634d177-82ae-445f-aa43-9068ad1d9392n%40googlegroups.com?utm_medium=email&utm_source=footer">https://groups.google.com/d/msgid/cp2k/7634d177-82ae-445f-aa43-9068ad1d9392n%40googlegroups.com</a>.<br />